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Table of Contents
Create a bootable macOS installer on a USB drive
Boot from the USB installer
Use Disk Utility to prepare your internal drive
Install macOS from the installer
Home Computer Tutorials System Installation How to install macOS on a Mac without a recovery partition?

How to install macOS on a Mac without a recovery partition?

Aug 01, 2025 am 02:44 AM
macos installation 無恢復(fù)分區(qū)

如果Mac沒有恢復(fù)分區(qū),可以通過創(chuàng)建外部可啟動安裝器來安裝macOS。具體步驟如下:1. 使用至少12GB的U盤下載macOS安裝程序(如Ventura、Monterey或Big Sur),并通過磁盤工具將其格式化為“Mac OS Extended (Journaled)”。2. 在終端中運行createinstallmedia命令,將U盤轉(zhuǎn)換為可啟動安裝器。3. 關(guān)閉Mac并插入U盤,開機時按住Option鍵選擇U盤啟動。4. 進(jìn)入macOS安裝環(huán)境后,使用磁盤工具選擇內(nèi)部硬盤并格式化為APFS或Mac OS Extended。5. 最后按照屏幕提示完成macOS安裝,安裝過程大約需要20至40分鐘,完成后Mac會自動重啟進(jìn)入設(shè)置助手。

How to install macOS on a Mac without a recovery partition?

If your Mac doesn't have a recovery partition, installing macOS might feel tricky at first, but it's definitely doable. The key is to create an external bootable installer and use that to get the job done.

How to install macOS on a Mac without a recovery partition?

Here’s how you can handle it step by step:

How to install macOS on a Mac without a recovery partition?

Create a bootable macOS installer on a USB drive

To install macOS without a recovery partition, you’ll need a USB flash drive (at least 12GB or more) to make a bootable installer. Apple provides tools for this, and it's straightforward if you follow the right steps.

  • Download the macOS installer from the App Store (like Ventura, Monterey, or Big Sur — depends on what your Mac supports).

    How to install macOS on a Mac without a recovery partition?
  • Plug in your USB drive and format it using Disk Utility: name it something like “MacOS Install,” and choose "Mac OS Extended (Journaled)" as the format.

  • Open Terminal and run the createinstallmedia command. For example, if you downloaded Ventura, the command would look like:

    sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/MacOS\ Install

This process will erase the USB drive and turn it into a full macOS installer.


Boot from the USB installer

Once you’ve created the bootable USB, you’re ready to start the installation process.

  • Shut down your Mac.
  • Plug in the USB drive.
  • Turn on your Mac while holding the Option (?) key — this brings up the startup manager where you should see your USB drive listed.
  • Select the USB volume and press Enter to boot from it.

From here, you'll land in the macOS Installer environment, which includes Disk Utility and the actual macOS installation option.


Use Disk Utility to prepare your internal drive

Before installing macOS, you need to make sure your internal drive is formatted correctly.

  • From the installer screen, go to Utilities > Disk Utility.
  • Select your main internal drive (not just a partition), and click "Erase."
  • Choose APFS (or Mac OS Extended if needed) as the format, depending on your Mac model and macOS version.
  • Give it a name like “Macintosh HD” and proceed with erasing.

Once that’s done, close Disk Utility and proceed to install macOS on the newly formatted drive.


Install macOS from the installer

Now that your drive is ready, the last step is to actually install macOS.

  • Follow the on-screen instructions — select your target disk (the one you just erased), and let the installer do its thing.
  • It may take 20–40 minutes depending on your hardware.
  • Once installed, your Mac should restart automatically and boot into the setup assistant.

Make sure to keep your USB installer handy in case you ever need to repair or reinstall macOS again.


That’s basically all there is to it. You don’t need a recovery partition if you've got a bootable installer ready. Just remember to match macOS versions to your Mac’s compatibility, and double-check the formatting steps so everything boots properly.

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